Avid PA player

Battle fury is viable if you want the game to go longer. If you're fighting a comp that wants to drag you to late game, you get the deso bkb and kill people, roshan and their ancient as fast as possible

Spikes are Deso, BF + Deso, Deso + BKB. Levels 2 and 3 on your ultimate are also very big. Then level 20, 25.

Hero falls off a bit lategame but it really depends what heroes are in the game. For example I like picking PA vs Lifestealer because I believe PA is good against him and outscales him. It also depends if you built BF or not. BF you're gonna be six slotted, Deso you're not gonna be.

As I said the hero falls off a bit, but I think not as much as some people think. Hero is a harder carry than say Jugger, but not Spectre. In the tier of like Sven. Having said that you need to be extremely careful lategame, but if you are careful and jump targets wisely you can still blow people up, and you out manfight a lot of heroes.

Following is copypasted cos people often ask about PA

If it gets to 20 mins and you have half a BF, you lost. If you're going BF you need to play very safe until you get it to ensure this doesn't happen.

If games are so hard that it's past 20 mins when getting it, you should have almost certainly gone Deso first, to be strong in fights as quickly as possible.

I'm almost always fight-ready by 27-30 minutes

This is really late, if you get BF at say 18 mins you should have Deso by ~22 minutes pretty easily. You have an INSANE power spike at these two items. If you REALLY need BKB though, keep farming until that which should be another ~5 mins later.

Generally, if your team is losing other lanes, if your farm isn't insanely good, you need to go Deso first item otherwise you will just lose before you can farm with BF. BF COULD work in these situations, but you have to splitpush, cut waves and play outrageously well, so basically don't do it.

If the game is going fine however, I believe BF to be good because you can farm a Deso in like 4 minutes with it and then you have 2 items rather than 1 and can keep farming at a really fast pace.

QB > Stick > Wraith > Wraith/Wand > Treads > Deso/BF > Deso/BKB > Basher

Always finish Boots. I think Treads are the best (maybe wrong on this). Armour from Phase is not amazing on PA and attack speed really helps with farming.

Talents are usually HP > Lifesteal > Corruption > Crit Chance. Levels 10 and 25 are up for some debate.

Just wanna say I've had games where I went BF, it was definitely wrong and we lost 5 minutes later. Also have games where I get Deso, try to gank with it, die, the game drags, I am underfarmed, and we lose lategame.

I play PA at ~4300 MMR and think I have a good understanding of the hero

At Legend Bracket, yes.

At Higher Mmr, it's very situational.

For your other point, yes PA falls of late game when she gets countered by specific heroes with MKB and can be killed within the iniitiation (Void, WR, Tinker too if he is very very fat). BUT it doesn't mean you get weaker. You still got your ULT which can 1 or 2 shot supports. It's just that you need to play with your team and around your item cooldowns more instead of rambo-ing in 1v5.

Think of it this way, if you're looking to farm (if you're buying fury), that means other team has time to farm eblade, a very BIG BIG counter to PA. So the later the game gets, the more eblades the enemy can have to protect each other. If you opt to go Deso and kill kill kill, you're slowing their eblade timings too while earning gold from killing them.

Speaking as a very avid Divine 4 PA picker, Battlefury is often the wrong choice but if you or the enemy team have no chance to end the game early its very good. Her spikes are Level 10, Deso/BF, Level 12, Deso if after BF, BKB, Level 18, Level 20, and Level 25. She falls off against the super late game cores such as spectre and medusa but otherwise does fine.

if you think you can win the game early then instead of bf just get deso bkb but if you know that their core is also having farm or you are just behind you can think about bf or maelstorm. i think her power spike at least for me after her first talent i feel more comfortable after giving talent point and she is good late game but maybe not good for super late

Late game, you're picking up satanic, right? Pretty necessary

I personally find mid PA to be so much more effective just because you hit level timings quicker and ganking/teamfighting earlier is more viable as the pos 2. Whenever I seem to play her as safelane I always seem to fall behind early but that could be more on me being a better 1v1 laner than a 2v2 laner. Also, the only time I ever go BF is if the enemy team has taken rax and I need to be able to keep the waves pushed out, otherwise it just seems like the item slows down my timings way too much. I would also say that basher is a must get after BKB just because of how effective it is with her kit.

I think you way want to reconsider the bkb purchase early. Items are extremely situational. For example if they don't have more than 1 lockdown don't bother with bkb and go for single target burst with deso + basher into abysal and pick up bkb satanic later in the game.

If they have a lot of lockdown then bkb early is ideal.

If your team is passive go battlefury before deso.

And so on...